How severe is CVE-2021-29249?

CVE-2021-29249 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2021-29249 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (64th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-29249?

CVE-2021-29249 affects Btcpayserver Btcpay Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-29249?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-29249 published?

CVE-2021-29249 was published on 2021-03-26 and last updated on 2026-06-17.

CVE-2021-29249

CVE-2021-29249 is a high-severity vulnerability in Btcpayserver Btcpay Server with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (64th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Btcpayserver Btcpay Server
Published: 2021-03-26
Last modified: 2026-06-17

Description

BTCPay Server before 1.0.6.0, when the payment button is used, has a privacy vulnerability.

Frequently asked questions

What is CVE-2021-29249?: BTCPay Server before 1.0.6.0, when the payment button is used, has a privacy vulnerability.
How severe is CVE-2021-29249?: CVE-2021-29249 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2021-29249 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (64th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-29249?: CVE-2021-29249 affects Btcpayserver Btcpay Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-29249?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-29249 published?: CVE-2021-29249 was published on 2021-03-26 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:btcpayserver:btcpay_server:*:*:*:*:*:*:*:*

More vulnerabilities in Btcpayserver Btcpay Server

CVE-2022-32984 — High (CVSS 7.5): BTCPay Server 1.3.0 through 1.5.3 allows a remote attacker to obtain sensitive information when a public Point of Sale…
CVE-2021-29246 — Medium (CVSS 6.7): BTCPay Server through 1.0.7.0 suffers from directory traversal, which allows an attacker with admin privileges to…
CVE-2021-29251 — Medium (CVSS 6.5): BTCPay Server before 1.0.7.1 mishandles the policy setting in which users can register (in Server Settings > Policies).…
CVE-2023-0879 — Medium (CVSS 6.3): Cross-site Scripting (XSS) - Stored in GitHub repository btcpayserver/btcpayserver prior to 1.7.12.
CVE-2021-3646 — Medium (CVSS 6.1): btcpayserver is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE-2023-1149 — Medium (CVSS 5.4): Improper Neutralization of Equivalent Special Elements in GitHub repository btcpayserver/btcpayserver prior to 1.8.0.

All CVEs affecting Btcpayserver Btcpay Server →